Woody Harrelson

Arthur Poppington / Defendor

Sandra Oh

Dr. Park

Elias Koteas

Chuck Dooney

Dakota Goyo

Jack Carter - 9

A.C. Peterson

Radovan Kristic

Tatiana Maslany

Olga

Peter Stebbings

Doctor

Michael Kelly

Paul Carter

Kat Dennings

Katrina Debrofkowitz

Clark Johnson

Roger Fairbanks

Tony Nappo

Biker Cliff

Lyriq Bent

Wayne

Kristin Booth

Wendy Carter

Lisa Ray

Dominique Ball

David Gardner

Grandpa Henry

Bryan Renfro

Mr. Debrofkowitz

Charlotte Sullivan

Poppington

Ron White

Judge Wilson

Graham Abbey

Constable Mike

Max Dreesen

Young Arthur

Matt Gordon

Jerry

James Preston Rogers

Biker Bob

Michael Cram

Blake

John Paul Ruttan

Jack Carter - 4